(x-5)+(x-4)+(x-3)=5x
x-5+x-4+x-3=5x
3x-(5+4+3)=5x
3x-12=5x
3x-5x=12
-2x=12
x=12/(-2)
x=-6
Vậy x=-6
x-5+x-4+x-3=5x
3x-12=5x
12=-2x
2x=-12
x=-6
(x-5)+(x-4)+(x-3)=5x
x-5+x-4+x-3=5x
x-x-x+(5+4+3)=5x
x-x-x+15=5x
x-x-x=15-5*x
x-x-x=10.x
Suy ra x=10
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